General Chemistry Answers

11. Which of the following elements form diatomic molecule held together by triple covalent bonds?

(a)   Oxygen (b) Lithium (c ) carbon (d) Nitrogen

11. Molecular orbital model is based upon which of the following models ?

(a)   Classical model (b) Bohr model) (c ) Quantum mechanical model (d) Democritus model

The antibiotic thiarubin-A was discovered by studying the feeding habits of wild

chimpanzees in Tanzania. The structure for thiarubin-A is

a. Complete the Lewis structure showing all lone pairs of electrons.

b. Indicate the hybrid orbitals used by the carbon and sulfur atoms in thiarubin-A.

c. How many σ and π bonds are present in this molecule?

One of the first drugs to be approved for use in treatment of acquired immune deficiency

syndrome (AIDS) was azidothymidine (AZT). Complete the Lewis structure for AZT.

a. How many carbon atoms are sp³ hybridized?  

b. How many carbon atoms are sp² hybridized?  

c. Which atom is sp hybridized?  

d. How many σ bonds are in the molecule? 

e. How many π bonds are in the molecule?

f. What is the N=N=N bond angle in the azide (–N₃) group?

g. What is the H–O–C bond angle in the side group attached to the five-membered ring?

h. What is the hybridization of the oxygen atom in the –CH₂OH group?

. Urea, a compound formed in the liver, is one of the ways humans excrete nitrogen.

The Lewis structure for urea is

Using hybrid orbitals for carbon, nitrogen, and oxygen, determine which orbitals overlap

to form the various bonds in urea. 

1.     The following ions are best described with resonance structures. Draw the resonance structures, and using formal charge arguments, predict the best Lewis structure for each ion. a. NCO^- b. CNO^-

1.     Describe the type of bonding that exists in the F₂(g) molecule. How does this type of bonding differ from that found in the HF(g) molecule? How is it similar?

4. Give one example of a compound having a linear molecular structure that has an overall dipole moment (is polar) and another example of a linear molecule that does not have an overall dipole moment (is non-polar). Do the same for molecules that have trigonal planar and tetrahedral molecular structures.

When Molybdenum(VI) Oxide and Zinc are heated together they react to form 

molybdenum (III) Oxide and Zinc (II) Oxide. What mass of Molybdenum (III) 

Oxide and Zinc (II) Oxide is formed when 20.0 grams of Molybdenum(VI) Oxide is 

reacted with 10.0 grams of Zn?

How many particles are in 2.5 x10 -3 kiloliters of Ammonium Chromate?